Cisco Unified Communications Manager (CUCM), formerly Cisco Unified CallManager and Cisco CallManager (CCM), is a software-based call-processing system developed by Cisco Systems. CUCM tracks all active VoIP network components; these include phones, gateways, conference bridges, transcoding resources, and voicemail boxes among others. CallManager often utilizes the Skinny Client Control Protocol (SCCP) as a communications protocol for signaling the hardware endpoints of the system, such as IP Phones. H.323, Media Gateway Control Protocol (MGCP) or Session Initiation Protocol (SIP) is used to pass call signaling to gateways.
Read more about Cisco Unified Communications Manager: Operation, Administration and Configuration, Cisco Unified Communications Manager Express
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